Tracing a meteoric trajectory with infrasound

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Tracing a meteoric trajectory with infrasound
Läslo Evers and Hein Haak evers_at_knmi.nl http//ww
w.knmi.nl/evers Royal Netherlands
Meteorological Institute (KNMI) Seismology
Division

The presented work is under review with Geoph.
Res. Lett.
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Dutch Infrasound Arrays
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Meteoric Infrasound in DBN
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Detections at DBN
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Meteoric Infrasound in DIA
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Detections at DIA
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Resolution I Fisher ratio response
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Resolution II best beams at DIA
Best beam 1st arrival 1.0 deg and 359.9 m/s
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Summary of the observations
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Localization through cross bearing
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(No Transcript)
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Atmospheric models
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Raytracing for the 1st arrival DIA
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Differential traveltime modeling
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Trajectory reconstruction
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Conclusions and discussion

• The source is identified as moving, this bolide
  could be located in 4D by two nearby arrays.
• Reported time of occurrence and path confirmed.
• Only convergent solutions found for ECMWF models.
• snr of 17 in DBN and 2 in DIA spatial coherence
  lost in larger aperture array, resp. 60 and 1500
  m.
• Average of DBN and DIA origin time correct, but
  an absolute difference of 8 sec caused by
  uncertainties in model and bearings.